$x^2-10x+21=0$
$4x^2-2y^2dx=2xydy$
$-6\:+9\:+4\:+\:-2\:-6\:-9\:-\:-3\:-5\:-6$
$-4a\left(2a-5b+4c\right)$
$\frac{dy}{dx}=y\left(2x-5\right)$
$\frac{x^{13}y^{11}}{x^5y^4}$
$100a^2+20a+1$
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